“This business of Prince Charles and Prince William not being there for the Trump visit was a snub,” a source told the Sunday Times. “They simply refused to attend. It’s a very, very unusual thing for the Queen to be there on her own. Usually she is accompanied by somebody. Prince Charles has been substituting for Philip a lot recently.”

The meeting was reportedly scheduled to be as short as possible, although it ran 17 minutes over the allotted 30 minutes.

On Friday, Trump is said to have broken protocol several times after arriving 12 minutes late to the meeting at Windsor Castle. The president failed to bow to the Queen before walking in front of her while they were inspecting the guard.

When Trump’s predecessor visited in 2016, he lunched with the Queen and her husband, Prince Phillip, before dining with the Duke and Duchess of Cambridge and Prince Harry.